Drawing in solution with a three-way safety bulb
Make sure there is enough solution in your beaker to completely
fill the pipet. (Never pipet a reagent directly from a reagent
Carefully place the attachment of the three-way bulb over
the mouth of the pipet. Squeeze the air valve (A) and the bulb
simultaneously to empty the bulb of air. Place the tip of the
pipet below the solution's surface in the beaker. Gradually squeeze
the suction valve (S) to draw liquid into the pipet. When the
liquid is above the specified volume, stop squeezing the suction
valve (S). Do not remove the bulb from the pipet.
DO NOT ALLOW LIQUID TO ENTER THE PIPET BULB. If the level
of the solution is not high enough, squeeze the air valve (A)
and the bulb again to expel the air from the bulb. Draw up more
liquid by squeezing the suction valve (S).
Touch the tip of the pipet to the inside of the beaker to remove the drop
hanging from the tip. If this drop is not eliminated, the volume
transferred will be slightly higher than the volume desired.